126557666000 has 40 divisors (see below), whose sum is σ = 306016441224. Its totient is φ = 50623065600.

The previous prime is 126557665987. The next prime is 126557666003. The reversal of 126557666000 is 666755621.

It can be written as a sum of positive squares in 4 ways, for example, as 3030722704 + 123526943296 = 55052^2 + 351464^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126557666003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31637417 + ... + 31641416.

Almost surely, 2^126557666000 is an apocalyptic number.

126557666000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126557666000 is an abundant number, since it is smaller than the sum of its proper divisors (179458775224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126557666000 is an equidigital number, since it uses as much as digits as its factorization.

126557666000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63278856 (or 63278840 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 126557666000 in words is "one hundred twenty-six billion, five hundred fifty-seven million, six hundred sixty-six thousand".